Tension device for loom-shuttles



(No Model.)

J. OUTHBERTSON. TENSION DEVICE FOR LVOOM SHUTTLES. No. 448,475.

clmwm/tg/ (QM/EV mmm atented Mar. 17, 1891.

UNITED ST JOHN CUTHBERTSON, OF

PATENT OFFICE.

LOIVELL, MASSACHUSETTS.

TENSION DEVICE FOR LOOlVl-SHUTTLES.

SPECIFICATION forming part of Letters Patent No. 448,475, dated March 17, 1891.

Application filed February 8, 1890. $erial No. 339,753. (No model.)

.To all whom it may concern.-

Be it known that I, JOHN CUTHBERTSON, of Lowell, in the county of Middlesex, State of Massachusetts, have invented certain new and useful Improvements in Tension Devices for Loom-Shuttles, of which the following is a description sufficiently full, clear, and exact to enable any person skilled in the art or science to which said invention appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure l is a plan view of a shuttle provided with my improvement; Fig. 2 is a side elevation of the same with the side broken away to show the tension device, and Fig. 3 is a vertical section taken on line 0c 00 in Fig. 1.

Like letters of reference indicate corresponding parts in the different figures of the drawings.

My invention relates to an adjustable tension mechanism for the filling-thread in loomshuttles; and it consists in certain novel features hereinafter fully set forth and claimed, the object being to produce a simpler, cheaper, and more effective device of this character than is now in ordinary use.

The nature and operation of the improve ment will be readily understood by all conversant with such matters from the following explanation.

In the drawings, A represents the body of the shuttle and B the thread.

The shuttle is provided with an eye I) opening into the bobbin-chamber in the usual manner. On the vertical wall of the bobbinchamber at the right, as viewed in Fig. 1, a plate d is secured, and. a lever f is pivoted to swing vertically on said plate, the upper end of said lever being provided with a head g, which, in its normal position, is flush or nearly flush with the top of the chamber-wall,where it may be readily manipulated by the thumb of the operator when threading the shuttle. A horizontally-arranged arm his secured to the forward end of the lever f and projects laterally across the bobbin-chamber parallel with the shuttle-eye. The outer end of said arm is provided with a vertical stud or projection "i, (see Fig. 3,) which engages the bot tom of said chamber, in which a horizontal wear-plate j is secured. A coiled spring 7r has one end secured to the plate (I and passes around the pivot of the leverf, said spring acting torsionally to hold the lever-arm h depressed or in engagement with the plate 3. To the upper edge of the plate (Z a cam-block m is seen red by a set-screw 19, said block being in engagement with the upper or free end of the lever fand serving as a stop to regulate the movement of said lever. A horizontall y arranged rod q extends from the plate d to the opposite wall of the bobbinchamber parallel with the lever-arm h and disposed above said arm, as shown in Fig. 3. This rod may be of a length to fit tightly between the wall and the plate, being held in position by endwise pressure or friction. It may therefore be adjusted by lateral pressure into different positions in the chamber. The edge of the wear-plate j adjacent to the shuttle-eye b is turned vertically upward, forming a partition if between said eye and the lever-arm h.

In the use of my improvement, the thread 13 is passed from the bobbin over the rod q. The head or thumb pieceg of the lever f being depressed, its arm h is elevated to permit the thread to be readily passed under said arm. From thence it is carried over the projection 15 and threaded through the eye I) in the usual manner. The lever being re leased its, arm h is forced downward by the spring 7c. The thread now being in engagement with the rod q, lever-arm h, and projection tbefore it passes through the eye, the friction of the thread upon these parts restrains its passage through the shuttle-eye, and a constant tension is thereby exerted on said thread. Sm-all knots or bunches can readily pass through the tension mechanism without breaking the filling.

It is frequently the custom to steam fillingthread to prevent it from kinking as it leaves the shuttle and making imperfect cloth. This process rapidly destroys the bobbins and renders the filling very tender and liable to break. My invention overcomes these objections, the friction of the thread passing over the obstructions offered by the rod, lever, and partition, as described, readily straightening the thread and causing it to pass smoothlythrough the eye. 13y moving the cam-block m outward against the lever f, so asto restrict the fall of the lever-arm h, the tension may be readily lessened. By moving the rod ,q forward in the bobbin-chamber and nearer the vertical plane of the lever-arm 7L, the tension 011 the thread will be thereby increased, said thread passing over said rod at a more acute angle in a manner readily understood Without a more explicit description.

The projection i on the lever-arm h prevents the thread from accidentally passing from under said arm. hen said arm is elevated by depressingthe lever-head g, as described, the shuttle may be threaded as readily as when no tension mechanism is employed.

Having thus explained my in vention, what I claim is 1. The combination of a shuttle-body. a spring-actuated tension-lever pivoted within the bobbin-chamber thereof, an adjustable stop for said lever, an arm on said lever proecting into the bobbin-chamber, and a rod extending across said chamber parallel with said arm, substantially as described.

2. The combination of a shuttle-body, a spring-actuated tension-leverfipivoted within the bobbin-chamber thereof and provided with the arm it, having the projection 'i, and the rod q, extending across said chamber, substantially as described.

3. The combination of a shuttle-body provided with a bobbin-chamber, a thread eye and a flange or partition in the bobbin-chamber adjacent to said eye, a rod extending across said chamber, and a spring-actuated tension-lever pivoted within said chamber and provided with a horizontal arm engaging the bottom thereof between said rod and flange, substantially as described.

4. The combination of a shuttlebody, a spring-actuated tension-lever pivoted within the bobbin-chamber thereof, an adjustable stop for said lever, and a horizontal arm on said lever projecting into thebobbin-chamber and provided with a vertical projection engaging the bottom thereof, substantially as described.

5. The combination of a shuttle-body, a.

spring-actuated tension-lever pivoted within the bobbin-chamber and having an arm projecting therein adjacent to the thread-eye end, and a cam-block, as m, pivoted to the Wall of said chamber in engagement with said lever and serving as an adjustable stop therefor.

6. The combination of the body A, the lever f, pivoted to the Wall of the bobbin-chamber thereof and having the arm h, provided with the stud t', the rod q, the adjustable stop 1%, and the partition 25, substantially as described.

JOHN CUTHBERTSON.

Vitnesses:

MARTIN L. HAMBLET, JOHN C. BURKE. 

